Menus: Hide the "Remove selected item" from Menus screen when no item is selected.

This changeset removes the "Remove selected item" from the classic Navigation Menus screen when no item is selected, and makes it non focusable from assistive technologies.

Plus, this changeset fixes a small unrelated coding standard issue in `nav-menus.css`.

Props kebbet, joedolson, audrasjb.
Fixes #56942.


git-svn-id: https://develop.svn.wordpress.org/trunk@55109 602fd350-edb4-49c9-b593-d223f7449a82

Author: audrasjb

src/wp-admin/css/nav-menus.css

@@ -169,7 +169,7 @@ label.bulk-select-button:focus-within {
 	color: #0a4b78;
 }
 
-input.bulk-select-switcher:focus + .bulk-select-button-label{
+input.bulk-select-switcher:focus + .bulk-select-button-label {
 	color: #0a4b78;
 }
 
@@ -191,9 +191,7 @@ input.bulk-select-switcher:focus + .bulk-select-button-label{
 }
 
 .bulk-actions input.menu-items-delete.disabled {
-	cursor: default;
-	color: #a7aaad;
-	box-shadow: none;
+	display: none;
 }
 
 .menu-settings {